Definition The Global Positioning System (GPS) is a space-based satellite navigation system that provides location and time information in all weather, anywhere on or near the Earth, where there is an unobstructed line of sight to four or more GPS satellites.
How does GPS works ? First the GPS satellites gives signal to the moniter station than that signal will be given to master station give names to the places and areas than that master station will finally give signal to the qausi zenich satellites and finally the devices will get information and signals.
Structure The current GPS consists of three major segments. These are the space segment (SS), a control segment (CS), and a user segment (US).] The U.S. Air Force develops, maintains, and operates the space and control segments. GPS satellites broadcast signals from space, and each GPS receiver uses these signals to calculate its three-dimensional location (latitude, longitude, and altitude) and the current time. The space segment is composed of 24 to 32 satellites in medium Earth orbit and also includes the payload adapters to the boosters required to launch them into orbit. The control segment is composed of a master control station, an alternate master control station, and a host of dedicated and shared ground antennas and monitor stations.
Trilateration Imagine you are standing somewhere on Earth with three satellites in the sky above you. If you know how far away you are from satellite A, then you know you must be located somewhere on the red circle. If you do the same for satellites B and C, you can work out your location by seeing where the three circles intersect. This is just what your GPS receiver does, although it uses overlapping spheres rather than circles. The more satellites there are above the horizon the more accurately your GPS unit can determine where you are.
GPS control Segments Master Control Monitor Station Station Six monitor stations are locatedThe master control station, located at at Schriever Air Force Base in Schriever Air Force Base in Colorado Colorado, Cape Springs, Colorado, is responsible for Canaveral, Florida, Hawaii, A overall management of the remote monitoring and transmission sites. scension Island in the Atlantic GPS ephemeris being a tabulation of Ocean, Diego Garcia Atoll in computed positions, velocities and the Indian Ocean, and derived right ascension and Kwajalein Island in the South declination of GPS satellites at specific times, replace "position" with Pacific Ocean. Each of the "ephemeris" because the Master monitor stations checks the Control Station computes not only exact position but also velocity, right ascension and declination parameters altitude, position, speed, and for eventual upload to GPS satellites overall health of the orbiting satellites. The control segment uses measurements collected by the monitor stations to predict the behavior of each satellites orbit and clock.
Ground antenaa Ground antennas monitor and track the satellites from horizon to horizon. They also transmit correction information to individual satellites.
Uses of GPS Military. Search and rescue. Disaster relief. Surveying. Marine, aeronautical and terrestrial navigation. Remote controlled vehicle and robot guidance. Satellite positioning and tracking. Shipping. Geographic Information Systems (GIS). Recreation.
Four Basic Functions ofGPS Position and coordinates. The distance and direction between any two waypoints, or a position and a waypoint. Travel progress reports. Accurate time measurement.